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J. A. BARNES AND S. W. SCHOFIELD.

SUPERHEATER.

APPLICATION FILED APR- 26.19). 1,311,868. Patented Aug. 5,1919.

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UNITED STATES PATENT OFFICE.

JOHN A BARNES, or w sr NEw RRIeHroN, NEW YORK, A D SAMUEL w. SCI-IOFIELD, or PA'r RsoN, NEW JERSEY, ssIeNoRs TO LOCOMOTIVE SUPERHEATER COMPANY, on NEW YORK, N. Y., A CORPORATION or DELAWARE.

SUPERHEATER.

Specification of Letters Patent.

Patented Aug. 5, 1919.

To all whom it may concern:

Be it known that JOHN A. BARNES and SAMUEL WILFRED SoHormLn, both citizens of the United States, and residents of West New Brighton, in the county of Richmond and State of New York, and Paterson, in the county of Passaiqstateof New Jersey, respectively, have jointly invented certain new and useful Improvements in Superheaters, of which the following is a specificatlon.

Our invention relates to superheaters and particularly to structures of this kind, applied to boilers which, generally speakmg comprise a vertically placed cylindrical body provided with vertical fire tubes. It has for its object the provision of an improved general arrangement and a means whereby the superheater header is utilized as a closure for the annular steam space at the top of the boiler.

The invention will readily be understood from a reading of the following description in connection with the accompanying drawing, forming a part'hereof.

In this drawing, Figure 1, is the central vertical section of a boiler with our invention applied; Fig. 2 is a top view of the same boiler with portions omitted. Fig. 3 is an enlargedview of a portion of Fig. 1. Fig. 4 is a view similar to Fig. 3 of a modificatlon. Fig. 5 is a similar view of another modification while Fig. 6 is a view of the same modification as Fig. 5 looking outward along a radial line.

In the form of the invention shown in Fig. 1, the boiler body is seen to comprise an outer sheet 1, a fire box sheet 2, a lower tube sheet 3, and an upper tube sheet 4. The two tube sheets are connected by the fire tubes 5, and the flues 6. The latter are considerably larger than the fire tubes 5, their lower end being somewhat restricted, as shown at 7. In the figure, ten such flues are shown and they are arranged in a circle about the center. Access to the fire box for purposes of feeding coal, etc., is provided through the door opening 8. The upper tube sheet 4 is located at some distance below the upper end of sheet 1 and its outer edge is turned upward as at 9, and is connected to the annular sheet 10, the arrangement resulting in an annular.

s ace 11. T e to of this annular space is c osed by the hen er 12, WhlCh is of peculiar construction and is more fully described in what follows.

The lower end of the smoke-hood 30 engages with sheet 1, while its upper end is suitably shaped for connection to a stack.

Into the flues 6 extend the superheater elements or units 13. These superheater elements are each made u of pipe lengths suitably joined by return ends so as to present a continuous channel. The two ends of each element are bent downward through 180 and attached to the header 12 in any suitable manner. We prefer the means of so securing them which we shall presently describe 'but it will be manifest that some other means might be used.

The header 12 is of annular shape and of such size and dimensions that it fits snugly into the top of the annular space 2. It is secured by means of rivets 31 to the two sheets and has within it, an annular chamber 14 (see Fig. 3) from which extend upward the openings 15. These openings 15 are the samein number as the superheater elements and are spaced to correspond to the spacing of flues 6. A corresponding series of openings 16 extend entirely through the header 12. The distance between each opening 15, and its corresponding opening 16, i in each casethe same, and between each pair of them, there is provided a tapped hole 17, into which there is screwed a stud (not shown). The ends of each unit are somewhat enlarged and are engaged by a clamp 18 which has in its center a hole 19, through which extends the stud just spoken of. A nut is then screwed on the stud and the clamp 18 is thus drawn downward and the element ends firmly held against the header.

This particular means of connecting the unit ends to the header is well known and forms no part of our invention except as it enters into combination with other portions.

A connection 20 for takin provided, communicating wit the annular chamber 14.

The form of the ap aratus just described operates as follows: 0t gases generated in the fire box pass upward, part of them through the fire tubes 5 and the remainder through the flues 6. The latter come into intimate contact with the portions of the superheater elements 13 which extend into off steam is.

the flues 6, and all of the gases after leaving the tubes and flues can give up additional heat to the portions of the elements above the upper tube sheet. The steam that is generated in the boiler collects in the annular space 11, leaving it by means of the openings 16, which delivers it to the superheater elements. After passing through these superheater elements and being heated to a high degree, the steam is delivered through the openings 15 into the annular space 1 1, whence it is carried through the connection 20 to the steam main.

It is evident that by the means described above, a good closure is provided for the upper end of the space 11, the closure forming at the same time a good header. The superheater elements are so placed that a high degree of superheat can be obtained. The means for securing the units to the header are such that each. individual element.

can be readily removed for cleaning or other purposes and readily reattached.

In the variation illustrated in Fig. 4, the ends of the superheater element 13 communicate with the spaces 11 and 14* directly through the sheet 10. The two spaces spoken of are separated from each other by means of a ring 21. The top of the space 14 is closed by means of the solid ring 22. Through the ring 21,and the adjacent portions of the sheets 10 and 1, there are openings to accommodate the bolts 23. These bolts take place of the studs spoken ofin the first form of our invention and serve to hold against the sheet 10 the enlarged heads of the element ends 13, by means of the clamp 18. .When the nut 24 is drawn up, the clamp 18 is pulled toward sheet 10 as will be evident from the figure. steam collecting in the upper portion of space 11 leaves this space through the lower of the two element ends 13, being delivered to the space 14 by the upper of these two ends. From the space 14; it is carried off through a connection not shown to the point desired.

The variation illustrated in Figs. 5 and 6, is similar to that of Fig. 4, in having the space of the superheated steam 141. lying directly above the space 11 and being separated from it by a rin 21?. This ring in this case, however, is wi er and its lower portion is riveted to what are, properly speaking, the upper ends of sheets land 10. Riveted to the upper portion of the ring are two other annular sheets numberedin the Figs. 25 and 26, respectively, the annular space between them being closed at the top by the ring 22.

Extending into the ring 21, are pairs of openings 15 and 16, each pair meant for the attachment of the two ends of one superheater element. The openings 15 are connected by means of ducts 27 to the spaace 11, while the openin 16 commumca with In this variation, the

space 14: by means of ducts 28. Between the two openings 15 and 16, the hole 29 extends through th ring 21*. It. will be understood that the ends of a superheater element are attached to the openings 15 and 16 by means of a bolt passing through the opening 29 in a manner very similar to that described in connection with Fig. 41. The steam collecting in the annular space 11 will leave this space through the ducts 2T, reaching the superheater elements through openings 15 and will on its return through opening 16, be delivered through duct 28 to the space 14:, from which it can be carried by suitable connection to the point of consumption.

It will be manifest that the forms of our invention described above are merely illustrative and that in practice, many variations can be introduced. Thus for example, it will be obvious that our invention can be applied to boilers of this type even where the upper portions of the sheets 1 and 10 are drawn in somewhat so as to become frusto-conical. The superheater units vary evidently; instead of extending into enlarged flues, loop into fire tubes no larger than those not occupied by units, in which case there would preferably be one loop to each tube. This is a well known variation in this connection.

What we claim is:

1. In a vertical boiler having a cylindrical shell, a lower and an upper tube sheet, tubes and flues connecting them, and a cylindrical sheet extending upward from the outer edge of the upper tube sheet and, with the shell, inclosing an annular steam space, the combination with said shell and said cylindrical sheet of an annular superheater .header, means to secure it between the upper portions of the shell and the sheet so that it serves as a closure for the steam space, the header having an annular space from which openings extend to its upper surface and having other openings through it whose inner ends communicate with the steam space, and tubular superheater elements extending into the fines and with their ends secured to the header openings.

2. In a vertical boiler having a cylindrical shell, a lower and an upper tube sheet, tubes and flues connecting them and a cylindrical sheet extending upward from the outer edge of upper tube sheet and, with the shell, inelosing an annular steam space. the combination with the shell and the cylindrical sheet of an annular superheater header, means to secure it between the upper portions of the shell and the sheet so that it serves as a cloing downwardly from the flue sheet; the combination of said cylindrical sheets, an annular superheater header secured between them at their upper ends, and superheater units secured to the header and extending into the flues. v

4. In a. vertical boiler having an annular steam space inclosed on its sides by two co-axially arranged sheets, the combination withsaid sheets of means serving as a closure for the top of the steam space and at the same time as a superheater header;

5. In a vertical fire-tube boiler having an annular steam space inclosed on its sides by two co-axially arranged sheets, the combination with said sheets of a superheater element and means to supply steam from the steam space to the element and to receive steam from the element, said means serving atthe same time as a closure for the top of the steam space.

6. In a vertical boiler having a steam space inclosed on its sides by two co-axially arranged cylindrical sheets, the combination with said sheets of an annular superheater header forming a closure for the upper end of the annular steam space.

JOHN A. BARNES. SAMUEL W. SCHOFIELD. 

